Helicopter



FIG. 1 is a perspective view of helicopter showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a larger scale fragmentary right side elevational view of the top central portion thereof. 

The ornamental design for a helicopter, as shown and described. 